closure-compiler
https://github.com/google/closure-compiler
Java
A JavaScript checker and optimizer.
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- Issues
- NullPointerException if --process_common_js_modules is paired with exports variable messing
- Can't optimize auto-called function
- Transpiled ES6 classes cannot extend non-transpiled ES6 classes
- Parse error with variable named 'static'
- dead code affects side-effect analysis
- Transpile /u and /y regex flags, or else explicitly warn if untranspilable
- Preserve the export statements of specific modules
- Use last type signature for redefined methods in externs
- Better typechecking for enums in switch/case statements.
- Conditional operator: when the condition and first expression are the same, OR could be used instead
- Docs
- Java not yet supported